Heating coil



w. H. SCHIRMER Aug. l, 1933.

' maAfrINer con.

Filed April 9, 1932 v 2 sheets-sheet 1 i f6 WHOLz/Wzef Aug. 1, 1933.

w. H. scHlRMER HEATING COIL Filed April 9, 1932 2 Sheets-Sheet `2Schi/mer z Lf Z.

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Patentedl Aug. 1,A 1933 UNITED STATES PATENT OFFICE l' This-inventionrelates to hot waterv boilers and more particularly to an improved typeof heat' ing coil for use in heating water in a boiler.

An object of this invention is to provide anY improved 'heating coilwhich can be readily mounted in any conventional type of water boilerand which is so constructed that it may be readily removed from orinserted in a boiler without taking the ends of the boiler olf as isnecessary in a number of coil constructions.

Another object of this invention is to provide a steam coil forinsertion in a boiler which is constructed of non-corrosive metal suchas copper or the like so that the coil will not corrode and will,therefore, last as long as, if not 1onger,.than

the boiler.

A still further object of this invention is to provide an improvedmounting means for the coil so that the joints of the coil will bedisposedy exteriorly of the boiler thereby rendering the repair orreplacement of the coil an exceedingly simple matter.

The above and various other objects and advantages of this inventionwill in part be described in and in part be understood from thefollowing detailed description of the present preferred embodiment, thesame being illustrated in the accompanying drawings, wherein:-

Figure 1 is a fragmentary detail side elevation of a boiler having acoil constructed according to the preferred embodiment of this inventionmounted therein.

Figure 2 is another form of this invention mounted in a vertical boiler.

Figure 3 is an enlarged longitudinal section partly in detail of theconnections for two portions of the coil and showing an enlargedfragmentary section of the boiler.

Figure 4 is a longitudinal sectional view of the cold water inletconnection for the boiler which is shown in fragmentary sectional form.

Figure 5 is an enlarged sectional view taken on the line 5--5 of Figure2.

Referring to the drawings wherein like numerals of reference designatecorresponding parts throughout the several views, the letter Bdesignates a conventional water boiler which has one end or head 10welded to the cylindrical wall 11 and the other end 13 is riveted, as at12. This type of boiler construction is conventional and furtherdescription thereof .is believed unnecessary. The boiler B is providedwith an intake pipe connection which may be attached to a pipe 14connected to a source of water supply, and this 5 pipe 14 is connectedthrough the medium o f a union I5 te e mpp'Ie I6 which is provided withinterior threads 17 and exterior threads 18. The

exterior threads of the nipple 16 engage a ilanged sleeve 19 which iswelded or otherwise securedto the cylindrical wall 11 of the boiler B.60

A curved pipe 20 engages the interior threads 17 of the nipple 16 and isopen at the inner end thereof and is disposed within the boiler B. Anoutlet pipe connection 21 is provided for the boiler B, and as this pipeconnection 21 is conventional, 65 further description thereof isbelieved unnecessary. A heating coil, generally designated as C, ismounted within the boiler B and is adapted to be connected to a sourceof heating supply, such as steam or the-like. This coil C comprises apair of substantially -L-shaped pipes 22 and 23 and preferably the pipe22 comprises the intake pipe and the pipe 23 is the outlet. The shortleg 24 of the pipe 22 is extended through the cylindrical wall 11 of theboiler B adjacent one end thereof 75 and as shown in Figure 5, theboiler B' is provided with a flanged sleeve25 which is provided withinterior threads and a threaded nipple 26 engages the threads of thesleeve 25, and is disposed about the extended end portion of the shortleg 24.

This nipple 26 has a nut portion 27 and a seat 28 against which the endof the short leg 24 is adapted to be pressed and flared by a threadednipple 29 which has a tapering inner end portion and serves in thecapacity of a sealing means for sealing the ared end portion 30 of thepipe 24 on the exterior of the boiler B. This nipple 29 may be connectedto any suitable source of heating supply such as steam or the like. Bydaring the free end of the pipe 24, as shown in Figure 5, the pipe isgrounded, and as the pipe 24 is of softer composition than the pipeconnections 26 and 29,

a tight joint will be provided, the joint being disposedentirely'outside of the boiler B.

The outlet pipe 23 extends through the cylin- 95 drical wall of theboiler B, as at 31, and the connection of the short leg 32 is similar tothe ,connection of the short leg 24 and it is, therefore, believed thatfurther detailed description of this connection is unnecessary. The endportion 10 100 of the boiler B is provided with a threaded sleeve '33within which a threaded nipple or pipe connection 34 is mounted, and thelong leg of the intake pipe member 22 extends through this pipeconnection 34. The pipe connection 34 1has threads adjacent each endthereof and intermediate the ends is provided with a nut portion 35. Theouter end of the pipe connection 34 is provided with a seat 36 againstwhich the end of the pipe 22 is pressed. A threaded collar 37 enf-ages110 lpressed against these pipe ends by means of the collar 37 so thatthese pipe ends will be grounded and will be nared against the seat 36and the reducingportion 38, thereby providing a seal disposed outside ofthe tank B. The other end of the U-shaped pipe 39 is connected to thereturn pipe 23 by means of a Joint structure 40 which is similar to thejoint structure for the intake pipe 22 and its connection with one endof the U- shaped pipe 39. y

In Figure 2, there is disclosed a vertical tank B wherein the intakepipe member 22 is shorter than the pipe 23 but I, of course, do not wishto be limited to this construction as the vertical tank B' may have thesame type of coil as that disclosed in Figure 1. In Figure 1, the tank Bis mounted horizontally. In Figure 2, the U-shaped connecting p ipev39'is provided with an intake` nipple 41 which may be connected to anintake pipe 42 connected to a source of heating supply.

The pipe connections 40' of the U-shaped member 39 are similar to thepipe connection herein before described and disclosed in more detail inFigure 3.

In Figure 2, the pipe 23' is connected to an outlet pipe 43 which ispreferably the same -source of outlet as the pipe 44 connected to thepipe 22. In other words, in the disclosure of Figure 2, the steam orheating medium flows in the same direction in each'pipe 22 and 23. 'Anintake pipe connection 14 is provided for the tank BIand is locatedadjacent the lower end of the tank, and a hot water outlet or draw-01Tconnection 21' is provided adjacent the top of the tank.

It will be noted from the foregoing that the coils C and C hereindisclosed may be mounted in any conventional hot water tank or boilerand through the construction of the pipes 22 and 23, the pipes may beinserted within the tanks without the necessity of removing the rivetedhead 13 o r of mounting the pipes 22 and 23 in the tanks beforev thehead 13 is riveted to the end of the tank.

lIn the event the tank B becomes damaged through corrosion or the like,lthe tank can be replaced and the same coil used in the new tank bymerely unthreading the pipe connections here- 'inbefore described and-reinserting these pipe 80y connections in the new tank. At the presenttime, various types of coils are in use which are mounted in hot watervtanks or boilers, but these coils must either be mounted Within thetanks before the tanks are completely built or closed or I where .thecoils are mounted in a tank in use, the riveted head of the tank must betaken olf and replaced, requiring a considerable expenditure on the partof the purchaser of the coil, whereas in thedisclosure hereinbeforedescribed, the coil can be readily inserted in a tank by any plumber orsteamfitter without in any way aifecting the construction of the tank.

lIt is, of course, understood that various changes and'modifications maybe made in the details of 95 construction and design of the abovespeciiically described embodiment of. this invention without departingfrom the spirit thereof, such changes and modications being restrictedonly by the scope of the following claim.

What is claimed isz- A tank coil and sealing means therefor comprising apipe having unthreaded end portions adapted to extend through andoutwardly of a tank wall, a iianged member adapted tob secured to a tankwall, a threaded sleeve loosely engaging about` an end of thepipe andhaving external threads engaging said flanged member,

a seat formed on the outer end of said sleeve, an

annular threaded member having one portion/110` thereof of lgreaterdiameter than another portion, said other portion loosely engaging abouta second pipe, a material between said two portions constituting asecond seat, and annular member having oppositely taperedperipheralportions interposed between said .t o 'seats and the abutting ends ofthe pipes to s'pread said ends and hold said ends againstthe seats uponinward movement of said angular threaded member. relative.- to thesleeve.'

WILLIAM H. SCHIRMER.

